Founded in
2018
Years of product engineering across mobile, web, SaaS and backend systems help us build apps around real user journeys and business goals.
Looking for a mobile app development company in the UK? Primocys helps startups and established businesses build custom iOS and Android apps with clear scope, the right technology, and a practical launch plan. Share your project goals to get a free app quote tailored to your business.
Get a Free App Quote →Successful mobile app development starts with understanding users and prioritising features. Primocys helps UK businesses plan apps with clear scope, milestones, and room to grow.
Whether you’re launching a digital service, improving an existing platform, or connecting customers with providers, we start with your business workflows. We identify user pain points, prioritise essential features, and define what belongs in your first release.
Our mobile app developers collaborate remotely with UK teams through agreed meeting times, shared requirements, milestone reviews, and regular progress updates. You stay informed about delivery progress, decisions, and next steps throughout your project.
We help define your first release by prioritising essential features, identifying what can wait, and assessing the work involved. After discovery, you receive a scoped estimate and realistic timeline to help you plan your investment with greater clarity.
From Flutter, iOS and Android apps to backend, APIs and cloud, one team builds your app end to end. We also build and run our own SaaS products, so we know what it takes to launch and grow an app.
2018
Years of product engineering across mobile, web, SaaS and backend systems help us build apps around real user journeys and business goals.
We design, build and market our own products, so we see app development from both sides: the code and the commercial results.
Business Communication Platform
AI Stories & Learning Companion
One team across UI/UX, iOS, Android, Flutter, backend, APIs, cloud and launch, so your app moves from idea to app store with one accountable partner.
Every project moves from discovery and UX to development, testing and app-store launch, with clear scope, visible milestones and regular reviews with your UK team.
1,200+ products delivered for 650+ clients across 30+ countries. See why UK businesses trust Primocys to build mobile apps that launch with confidence.
Explore mobile app development services for UK businesses, from iOS, Android and Flutter apps to UX design, integrations and ongoing support. Build what your business needs today, with room to scale as you grow.
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Swift-based iPhone and iPad apps for UK businesses, built around Apple’s standards with App Store submission planned from day one.
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Android apps built to run reliably across the screen sizes and OS versions your UK customers actually use.
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One shared codebase for iOS and Android, a practical route to both platforms where Flutter fits your requirements.
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Launch the smallest useful version first, test it with real users and build your roadmap on evidence, not guesswork.
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Design intuitive mobile app experiences with clear onboarding, accessible interfaces, and user journeys that help customers complete key tasks with less friction.
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Build booking and on-demand apps that connect customers with service providers through scheduling, live availability, payments, notifications, and tools to manage daily operations.
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Add AI assistants, intelligent search, and workflow automation to your mobile app where they solve real user or business problems, with appropriate human oversight.
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Update a legacy app’s UX, architecture and integrations in phases, without assuming everything must be rebuilt. Improve performance, strengthen security, and make room for future growth.
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keep your mobile app reliable after launch with bug fixes, monitoring, iOS and Android compatibility updates, performance improvements, and ongoing feature development.
See how Primocys turns app ideas into working products, from community messaging and customer communication to AI storytelling, each shaped by real user journeys and business goals.
Primocys builds custom mobile apps for UK startups and established businesses, aligning features, technology and launch plans with your users, workflows and business goals.
Build on-demand and marketplace apps with booking, provider availability, location features and admin dashboards to connect customers with providers and simplify daily operations.
Marketplace app development →Build health and wellness apps with appointment scheduling, personalised user journeys and engagement tools, supported by privacy-conscious workflows from the start.
Healthcare app development →Build social and community apps with user profiles, content feeds, messaging, notifications and moderation tools, with live features added when your audience needs them.
Social app development →Create ecommerce and retail apps with product discovery, customer accounts, secure checkout integrations and order tracking to make shopping easier on mobile.
Ecommerce app development →Build business and productivity apps that connect field workflows, internal approvals, reporting and existing systems to reduce manual work and improve operational visibility.
Enterprise software development →Build media and entertainment apps with digital content, subscriptions and live or on-demand streaming features to deliver engaging experiences across mobile devices.
Media app development →A simple booking MVP and a multi-role marketplace need very different effort. Here is what drives the cost of your app, and how to keep it under control before a single line of code is written.
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The number of user roles, screens and business rules is the biggest driver of build and testing effort.
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Building for iOS, Android or both changes the plan, and the technology you choose affects long-term maintenance.
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Payments, maps, existing systems and data migration all add API work, security and testing.
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Custom UX, device coverage, accessibility checks and post-launch support all shape the final scope.
Step 1
Answer a few questions about your app to get a quick starting point for your budget.
Open the calculator →Step 2
Tell us your users, goals and must-have features. We reply within 24 hours.
Contact our team →Step 3
After discovery, you get a written scope, priorities and timeline, so you decide with clear numbers.
Read the cost guide →Most focused MVPs take around 8–16 weeks. See how long it takes to build a mobile app. Final pricing is confirmed in a written estimate after discovery.
There is no universal best stack. The right choice depends on your users, the device features you need, your release schedule and how you plan to maintain the app.
Choose it when your audience is mainly on iPhone, or your brief depends on Apple-specific features and platform polish.
Trade-off: Android needs a separate build later.
Choose it when your audience skews Android, or you need deep device-level features and wide device coverage.
Trade-off: iOS needs a separate build later.
Choose it when you want iOS and Android from one shared codebase, with a consistent experience on both.
Trade-off: a few highly platform-specific features may need native code.
Compare in depth: iOS vs Android · Flutter vs React Native vs native
We build privacy and reliability into the app from the start, so data protection is part of the design, not a last-minute patch.
Consent and permission prompts that users understand, with choices respected across the app.
We collect only what the app needs and plan retention and third-party data flows with you.
Authentication and role-based access controls designed in from the first release.
Device, API and accessibility testing before launch, so the app holds up in real use.
We help implement agreed technical safeguards. UK GDPR interpretation should be confirmed with your legal or data-protection adviser.
We choose technologies around your app’s features, users, and budget to deliver reliable performance, easier maintenance ,and room for your UK business to grow.
Our mobile app development process keeps scope, costs and milestones clear. With regular updates and reviews, you stay informed, involved and ready for each next step.
Get clear milestones, transparent costs and collaboration that fits your schedule. You’ll know what’s delivered, what decisions are needed and what comes next at every stage.
Talk to our app developersWork progresses through agreed milestones, so you can review working features, share feedback and make informed decisions at every stage.
We work with your team through agreed meeting times, shared requirements and regular progress updates, keeping decisions clear and remote collaboration predictable.
We prioritise essential features and align design with engineering, helping you launch a focused first version, test demand and make smarter decisions about what to build next.
We plan access controls, consent flows and data minimisation early, helping you address privacy requirements and reduce avoidable rework as your app evolves.
We clarify code ownership, account access and third-party licensing arrangements, then document the handover. Post-launch support helps keep your app reliable as your needs change.
Recognised by Clutch as a Top Flutter Developer in 2024 and 2026, we recommend Flutter when it fits your goals and native development when it better serves your app.
Choose a mobile app development engagement model that fits your project scope, budget and level of control—from fixed-price delivery to a dedicated team or flexible development support.
Ideal for a clearly defined project, such as an MVP. Pay against agreed milestones based on a scoped quote confirmed after discovery, with any changes approved in writing before additional work begins.
Ideal for products with an evolving roadmap. Set priorities with a dedicated team, agree monthly rates and adjust team capacity according to your requirements and the terms of your agreement.
Ideal for projects where requirements may evolve. Pay for the time and resources used, with transparent time records and regular reviews to adjust priorities as you learn more about user needs.
Ideal when your in-house team needs additional skills or capacity. Add iOS, Android or Flutter developers to your existing workflows, with responsibilities and reporting agreed to fit your team.
Custom iOS, Android and Flutter apps for healthcare, fintech, real estate and more. Tell us your industry and goals and get a free app quote shaped around your users.
Explore mobile app development costs, timelines, technologies, source code ownership and ongoing support. Find out how Primocys helps UK businesses plan, build and maintain apps around their goals.
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